Use cleanup with retry on Windows for all scripts.

copy_apprtc.py

 #!/usr/bin/python
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Moves Apprtc to the out/ directory, where the browser test can find it."""
 
 import fileinput
 import os
 import shutil
 import sys
 
 import utils
 
 
 def _ConfigureApprtcServerToDeveloperMode(app_yaml_path):
   if not os.path.exists(app_yaml_path):
     return 'Expected app.yaml at %s.' % os.path.abspath(app_yaml_path)
 
   for line in fileinput.input(app_yaml_path, inplace=True):
     # We can't click past these in the firefox interop test, so
     # disable them.
     line = line.replace('BYPASS_JOIN_CONFIRMATION: false',
                         'BYPASS_JOIN_CONFIRMATION: true')
     sys.stdout.write(line)
 
 
 def main():
   target_dir = os.path.join('src', 'out', 'apprtc')
-  if utils.GetPlatform() is 'win':
-    # Windows shutil can't handle the long node.js paths when deleting;
-    # work around the problem.
-    os.system('rmdir /s /q %s' % target_dir)
-  else:
-    shutil.rmtree(target_dir, ignore_errors=True)
+  utils.RemoveDirectory(target_dir)
   shutil.copytree('apprtc',
                   target_dir, ignore=shutil.ignore_patterns('.svn', '.git'))
 
   app_yaml_path = os.path.join(target_dir, 'src', 'app_engine', 'app.yaml')
   _ConfigureApprtcServerToDeveloperMode(app_yaml_path)
 
 
 if __name__ == '__main__':
   sys.exit(main())